Whether you are allowed a carry-on bag in United Economy depends entirely on which type of Economy ticket you purchased. If you booked a standard Economy ticket, you are permitted one full-sized carry-on bag for the overhead bin plus one small personal item for under the seat. However, if you booked a Basic Economy ticket, you are strictly limited to one personal item only (max 9 x 10 x 17 inches). In 2026, United remains very firm on this: if a Basic Economy passenger brings a full-sized carry-on to the gate, they will be forced to gate-check it and pay the standard checked bag fee plus a $25 gate handling surcharge. There are exceptions for Premier members, Star Alliance Gold members, and those using a qualifying United Chase credit card, who still get a carry-on even on Basic Economy fares. For transborder flights to Canada or international transoceanic flights, Basic Economy usually does include a carry-on, but for U.S. domestic flights, the "personal item only" rule is the standard for the lowest fare tier.